Adolph p



(No M0de1.) l A A. F. BREWER.

SUPPLEMENTAL BED PLATE, GENTERING DEVICE, ANI)l WORK HOLDER POR DEILLING 0E SLOTTING MACHINES.

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IINiTnD STATES ATENT Fries.

ADOLPH F. BREWER, OF SAN FRANCISCO, CALIFORNIA.

ySUPPLEMENTAL BED-PLATE, CENTERING DEVICE, AND WORK-HOLDER FOR DRILLKING R SLOTTING` MACHINES.

SPECIFICATION forming part of Letters Patent No. 355,679,7dated Jjanuary11,.18`87. y

Applicants] filed ocmbf-r 1, isst.

.ToaZZ whom, it may concern:

' citizen of the United States, residing in the city and county of San Francisco, and State of California, have invented a new and useful Combined Adjustable Bed-Plate Guide with Upper and Under Shaft-Centering V-Blocks for Drill-Presses; of which the following is a specification.

My invention relates to combined bed-plate guide-block with centering V-lolocksk for centering shafts and drilling the same, and headbloeks for milling and working tapering tools. It will be readily understood by reference to the accompanying drawings and the let-ters referring thereto.

Figure l is a perspective view showing a shaft centered in position to beclamped and held in line for working, as will be `fully eX- plained. A part is broken out to show the feed-screw attachment with the V-bloek. Fig. 2 is a cross-section cut ,through the center of the guideblock, designed to show the form of the same. Fig. 3 is a cross-section of the same -as Fig. 2, with the clamping V-block' in position for clamping a shaft. Fig. 4 ris a cross section showing the arrangement for the adjustment of the head-block. Fig. 5 is a perspective view showing the head-blocks with a tapering tool or tap in position to be milled. Fig. '6 is a longitudinal section of Fig. 5 upon a reduced scale. Fig. 7 is a longitudinal section of the back head-block cut through the back center. f

The following is a description of the construction and operation of the device. The metal employed is similar to that employed in the manufacture of that class of construction.

A represents the main frame forming the body of the guideblock. B represents the guide-grooves ofthe guidebloek.

.C represents the end piece in which the feedscrew operates.

D represents the feed-screw.

. E represents the clamping V-block.

F represents the rear rV-block.

G represents the hand-wheel for the feedscrew.

Serial No. 2l5,063. (No model.)

II represents the upper V-bloek for cooperatingwith the clamping V-lolock.

I represents the clamping set-screw.

J represents the shaft as it is centered in the lathe.

K represents the clamping-block of a drillmandrel. v

L represents the drill-mandrel. V

In Fig. 5, M represents the head-block. N represents the set-.screw for the mandrel of the face-plate. O represents the gage face-plate. P represents the dog. tool. R represents the tail-block mandrel. S represents the vset-screw. T represents the adjustable bearingblock on the tail-block.

U represents the hand-wheel for adjusting the mandrel; V, the adjusting-screws W, the raising and lowering set-screw. X represents the guide on the tail-block. vY represents the tail-block. Z represents the bent standard or frame for the set-point; C,the set-point for the face-plate. A represents the rod which connects the head and tail block, (shown in Figs. 5 and 6;) B', the guide-plate; D', the guidegroove in the guide-plate; E', the ledge-de signed to receive the clamping bar or hook for clamping the guide-block A to the plate of the machine with which it is used. F"represents the chip-chamber. f

I sometimes employ two clamping V-bloeks for holding the shaft in position while drilling; but for ordinary work oneis sufficient, as shown in Fig. l.

When drilling ashaft, I place it in the position shown in Fig. l. bringing the drill-mandrel L down so `thatV-bloek K brings the center of the shaft J directly under the center of the mandrel L. I then clamp the guide-block A firmly to the bed-plate of the drill, and as each hole is drilled I move the clamping V-block E forward until the distance which is drilled is sufficient to form the required slot; or, where a slot or groove is reqniredto be nished at a single operation, the clamping V-block E is fed regularly along by the feedscrew D. As the feed-screw draws the shaft perfectly in line with its axis and insures the perfect line of the eut and forms a smooth slot or groove, it is nished at a single eut of the Q represents the taper milling-tool. When the Cuttingedges of a tool are to be formed, I place the head-block M and tail-block Y in the guide-block and support the tool between the head and tail centers, as shown in Fig. 5. I raise the bearing-block T of the tail-block until the upper line ofthe tool Q is brought to a position parallel with the guide-grooves of the block A by means of the raising and lowering screw W. I then set the bearing-blockY T fast, and perfectly adjust the same by means of the adjusting-screws V.

Any tool or article to be Worked` must be centered by the same means as the shaft J- that is to say, by bringing the V-block K down upon the same and setting it perfectly under the center of'the mandrel. Then the feedscrew D being operated insures a perfectlylongitudnal Vmovement corresponding with the line of the guide-grooves B, and the tool is cnt in a line parallel with the same; or by revolving the tool Q ata regular rate of speed.

a spiral groove or cut may be formed. The chip-chamberFis of suicient capacity to hold all the chips or borings liable to result from any ordinaryjob of cutting, milling, or boring in working a single piece of shafting, a tool, or other article. It is formed by simply hollowing ont the under side of the block A,With ont inipairing the strength of the same.

I do not confine myself to the exact form of the purposes set forth.

2. The guideblock A, having the guidegrooves B,in combination with the V-blocks E and F, for the purpose of centering va shaft under a drill-mandrel, constructed and operated substantially as and for the purposes set forth.`

3. The guide-block A, having the guidegrooves B and the feed-screw D, in combination with the head-block M, having the gage face-plate O, and the tail-block Y,With the adjustablejournal-box or head T, for the purpose of working tapering pieces of metal, constructed and operated substantially as and. for the purposes set forth.

ADOLPH F. BREWER. Witnesses:

JOHN H. BEnsToNF., F. T. MORRELLE. 

